parser: Break float tokens into parts in tuple field positions
This commit is contained in:
Vadim Petrochenkov
parent
8a6d4342be
commit
8e256b19d5
@ -770,10 +770,10 @@ impl<'a> Parser<'a> {
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match self.token.uninterpolate().kind {
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token::Ident(..) => self.parse_dot_suffix(base, lo),
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token::Literal(token::Lit { kind: token::Integer, symbol, suffix }) => {
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Ok(self.parse_tuple_field_access_expr(lo, base, symbol, suffix))
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Ok(self.parse_tuple_field_access_expr(lo, base, symbol, suffix, None))
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}
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token::Literal(token::Lit { kind: token::Float, symbol, .. }) => {
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self.recover_field_access_by_float_lit(lo, base, symbol)
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token::Literal(token::Lit { kind: token::Float, symbol, suffix }) => {
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Ok(self.parse_tuple_field_access_expr_float(lo, base, symbol, suffix))
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}
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_ => {
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self.error_unexpected_after_dot();
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@ -788,45 +788,84 @@ impl<'a> Parser<'a> {
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self.struct_span_err(self.token.span, &format!("unexpected token: `{}`", actual)).emit();
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}
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fn recover_field_access_by_float_lit(
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// We need and identifier or integer, but the next token is a float.
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// Break the float into components to extract the identifier or integer.
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// FIXME: With current `TokenCursor` it's hard to break tokens into more than 2
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// parts unless those parts are processed immediately. `TokenCursor` should either
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// support pushing "future tokens" (would be also helpful to `break_and_eat`), or
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// we should break everything including floats into more basic proc-macro style
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// tokens in the lexer (probably preferable).
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fn parse_tuple_field_access_expr_float(
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&mut self,
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lo: Span,
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base: P<Expr>,
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sym: Symbol,
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) -> PResult<'a, P<Expr>> {
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self.bump();
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let fstr = sym.as_str();
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let msg = format!("unexpected token: `{}`", sym);
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let mut err = self.struct_span_err(self.prev_token.span, &msg);
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err.span_label(self.prev_token.span, "unexpected token");
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if fstr.chars().all(|x| "0123456789.".contains(x)) {
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let float = match fstr.parse::<f64>() {
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Ok(f) => f,
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Err(_) => {
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err.emit();
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return Ok(base);
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}
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};
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let sugg = pprust::to_string(|s| {
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s.popen();
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s.print_expr(&base);
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s.s.word(".");
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s.print_usize(float.trunc() as usize);
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s.pclose();
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s.s.word(".");
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s.s.word(fstr.splitn(2, '.').last().unwrap().to_string())
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});
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err.span_suggestion(
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lo.to(self.prev_token.span),
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"try parenthesizing the first index",
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sugg,
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Applicability::MachineApplicable,
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);
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float: Symbol,
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suffix: Option<Symbol>,
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) -> P<Expr> {
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#[derive(Debug)]
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enum FloatComponent {
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IdentLike(String),
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Punct(char),
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}
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use FloatComponent::*;
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let mut components = Vec::new();
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let mut ident_like = String::new();
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for c in float.as_str().chars() {
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if c == '_' || c.is_ascii_alphanumeric() {
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ident_like.push(c);
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} else if matches!(c, '.' | '+' | '-') {
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if !ident_like.is_empty() {
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components.push(IdentLike(mem::take(&mut ident_like)));
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}
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components.push(Punct(c));
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} else {
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panic!("unexpected character in a float token: {:?}", c)
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}
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}
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if !ident_like.is_empty() {
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components.push(IdentLike(ident_like));
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}
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// FIXME: Make the span more precise.
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let span = self.token.span;
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match &*components {
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// 1e2
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[IdentLike(i)] => {
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self.parse_tuple_field_access_expr(lo, base, Symbol::intern(&i), suffix, None)
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}
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// 1.
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[IdentLike(i), Punct('.')] => {
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assert!(suffix.is_none());
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let symbol = Symbol::intern(&i);
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self.token = Token::new(token::Ident(symbol, false), span);
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let next_token = Token::new(token::Dot, span);
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self.parse_tuple_field_access_expr(lo, base, symbol, None, Some(next_token))
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}
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// 1.2 | 1.2e3
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[IdentLike(i1), Punct('.'), IdentLike(i2)] => {
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let symbol1 = Symbol::intern(&i1);
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self.token = Token::new(token::Ident(symbol1, false), span);
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let next_token1 = Token::new(token::Dot, span);
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let base1 =
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self.parse_tuple_field_access_expr(lo, base, symbol1, None, Some(next_token1));
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let symbol2 = Symbol::intern(&i2);
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let next_token2 = Token::new(token::Ident(symbol2, false), span);
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self.bump_with(next_token2); // `.`
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self.parse_tuple_field_access_expr(lo, base1, symbol2, suffix, None)
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}
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// 1e+ | 1e- (recovered)
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[IdentLike(_), Punct('+' | '-')] |
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// 1e+2 | 1e-2
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[IdentLike(_), Punct('+' | '-'), IdentLike(_)] |
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// 1.2e+3 | 1.2e-3
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[IdentLike(_), Punct('.'), IdentLike(_), Punct('+' | '-'), IdentLike(_)] => {
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// See the FIXME about `TokenCursor` above.
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self.error_unexpected_after_dot();
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base
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}
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_ => panic!("unexpected components in a float token: {:?}", components),
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}
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Err(err)
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}
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fn parse_tuple_field_access_expr(
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@ -835,8 +874,12 @@ impl<'a> Parser<'a> {
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base: P<Expr>,
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field: Symbol,
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suffix: Option<Symbol>,
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next_token: Option<Token>,
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) -> P<Expr> {
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self.bump();
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match next_token {
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Some(next_token) => self.bump_with(next_token),
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None => self.bump(),
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}
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let span = self.prev_token.span;
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let field = ExprKind::Field(base, Ident::new(field, span));
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self.expect_no_suffix(span, "a tuple index", suffix);
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62
src/test/ui/parser/float-field.rs
Normal file
62
src/test/ui/parser/float-field.rs
Normal file
@ -0,0 +1,62 @@
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struct S(u8, (u8, u8));
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fn main() {
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let s = S(0, (0, 0));
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s.1e1; //~ ERROR no field `1e1` on type `S`
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s.1.; //~ ERROR unexpected token: `;`
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s.1.1;
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s.1.1e1; //~ ERROR no field `1e1` on type `(u8, u8)`
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{ s.1e+; } //~ ERROR unexpected token: `1e+`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+`
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//~| ERROR expected at least one digit in exponent
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{ s.1e-; } //~ ERROR unexpected token: `1e-`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-`
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//~| ERROR expected at least one digit in exponent
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{ s.1e+1; } //~ ERROR unexpected token: `1e+1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+1`
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{ s.1e-1; } //~ ERROR unexpected token: `1e-1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-1`
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{ s.1.1e+1; } //~ ERROR unexpected token: `1.1e+1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e+1`
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{ s.1.1e-1; } //~ ERROR unexpected token: `1.1e-1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e-1`
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s.0x1e1; //~ ERROR no field `0x1e1` on type `S`
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s.0x1.; //~ ERROR no field `0x1` on type `S`
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//~| ERROR hexadecimal float literal is not supported
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//~| ERROR unexpected token: `;`
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s.0x1.1; //~ ERROR no field `0x1` on type `S`
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//~| ERROR hexadecimal float literal is not supported
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s.0x1.1e1; //~ ERROR no field `0x1` on type `S`
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//~| ERROR hexadecimal float literal is not supported
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{ s.0x1e+; } //~ ERROR expected expression, found `;`
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{ s.0x1e-; } //~ ERROR expected expression, found `;`
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s.0x1e+1; //~ ERROR no field `0x1e` on type `S`
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s.0x1e-1; //~ ERROR no field `0x1e` on type `S`
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{ s.0x1.1e+1; } //~ ERROR unexpected token: `0x1.1e+1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `0x1.1e+1`
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//~| ERROR hexadecimal float literal is not supported
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{ s.0x1.1e-1; } //~ ERROR unexpected token: `0x1.1e-1`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `0x1.1e-1`
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//~| ERROR hexadecimal float literal is not supported
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s.1e1f32; //~ ERROR no field `1e1` on type `S`
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//~| ERROR suffixes on a tuple index are invalid
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s.1.f32; //~ ERROR no field `f32` on type `(u8, u8)`
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s.1.1f32; //~ ERROR suffixes on a tuple index are invalid
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s.1.1e1f32; //~ ERROR no field `1e1` on type `(u8, u8)`
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//~| ERROR suffixes on a tuple index are invalid
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{ s.1e+f32; } //~ ERROR unexpected token: `1e+f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+f32`
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//~| ERROR expected at least one digit in exponent
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{ s.1e-f32; } //~ ERROR unexpected token: `1e-f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-f32`
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//~| ERROR expected at least one digit in exponent
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{ s.1e+1f32; } //~ ERROR unexpected token: `1e+1f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+1f32`
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{ s.1e-1f32; } //~ ERROR unexpected token: `1e-1f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-1f32`
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{ s.1.1e+1f32; } //~ ERROR unexpected token: `1.1e+1f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e+1f32`
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{ s.1.1e-1f32; } //~ ERROR unexpected token: `1.1e-1f32`
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//~| ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e-1f32`
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}
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349
src/test/ui/parser/float-field.stderr
Normal file
349
src/test/ui/parser/float-field.stderr
Normal file
@ -0,0 +1,349 @@
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error: expected at least one digit in exponent
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--> $DIR/float-field.rs:10:9
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LL | { s.1e+; }
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| ^^^
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error: expected at least one digit in exponent
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--> $DIR/float-field.rs:13:9
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LL | { s.1e-; }
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| ^^^
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error: hexadecimal float literal is not supported
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--> $DIR/float-field.rs:25:7
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LL | s.0x1.;
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| ^^^^
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error: hexadecimal float literal is not supported
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--> $DIR/float-field.rs:28:7
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LL | s.0x1.1;
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| ^^^^^
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error: hexadecimal float literal is not supported
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--> $DIR/float-field.rs:30:7
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LL | s.0x1.1e1;
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| ^^^^^^^
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error: hexadecimal float literal is not supported
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--> $DIR/float-field.rs:36:9
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LL | { s.0x1.1e+1; }
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| ^^^^^^^^
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error: hexadecimal float literal is not supported
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--> $DIR/float-field.rs:39:9
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LL | { s.0x1.1e-1; }
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| ^^^^^^^^
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error: expected at least one digit in exponent
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--> $DIR/float-field.rs:48:9
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LL | { s.1e+f32; }
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| ^^^^^^
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error: expected at least one digit in exponent
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--> $DIR/float-field.rs:51:9
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LL | { s.1e-f32; }
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| ^^^^^^
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error: unexpected token: `;`
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--> $DIR/float-field.rs:7:9
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LL | s.1.;
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| ^
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error: unexpected token: `1e+`
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--> $DIR/float-field.rs:10:9
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LL | { s.1e+; }
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| ^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+`
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--> $DIR/float-field.rs:10:9
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LL | { s.1e+; }
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| ^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `1e-`
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--> $DIR/float-field.rs:13:9
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LL | { s.1e-; }
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| ^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-`
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--> $DIR/float-field.rs:13:9
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LL | { s.1e-; }
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| ^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `1e+1`
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--> $DIR/float-field.rs:16:9
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LL | { s.1e+1; }
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| ^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+1`
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--> $DIR/float-field.rs:16:9
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LL | { s.1e+1; }
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| ^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `1e-1`
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--> $DIR/float-field.rs:18:9
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LL | { s.1e-1; }
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| ^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-1`
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--> $DIR/float-field.rs:18:9
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LL | { s.1e-1; }
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| ^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `1.1e+1`
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--> $DIR/float-field.rs:20:9
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LL | { s.1.1e+1; }
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| ^^^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e+1`
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--> $DIR/float-field.rs:20:9
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LL | { s.1.1e+1; }
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| ^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `1.1e-1`
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--> $DIR/float-field.rs:22:9
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LL | { s.1.1e-1; }
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| ^^^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e-1`
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--> $DIR/float-field.rs:22:9
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LL | { s.1.1e-1; }
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| ^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `;`
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--> $DIR/float-field.rs:25:11
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LL | s.0x1.;
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| ^
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error: expected expression, found `;`
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--> $DIR/float-field.rs:32:14
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LL | { s.0x1e+; }
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| ^ expected expression
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error: expected expression, found `;`
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--> $DIR/float-field.rs:33:14
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LL | { s.0x1e-; }
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| ^ expected expression
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error: unexpected token: `0x1.1e+1`
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--> $DIR/float-field.rs:36:9
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LL | { s.0x1.1e+1; }
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| ^^^^^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `0x1.1e+1`
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--> $DIR/float-field.rs:36:9
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|
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LL | { s.0x1.1e+1; }
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| ^^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: unexpected token: `0x1.1e-1`
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--> $DIR/float-field.rs:39:9
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LL | { s.0x1.1e-1; }
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| ^^^^^^^^
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error: expected one of `.`, `;`, `?`, `}`, or an operator, found `0x1.1e-1`
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--> $DIR/float-field.rs:39:9
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|
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LL | { s.0x1.1e-1; }
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| ^^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
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error: suffixes on a tuple index are invalid
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--> $DIR/float-field.rs:42:7
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LL | s.1e1f32;
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| ^^^^^^ invalid suffix `f32`
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error: suffixes on a tuple index are invalid
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--> $DIR/float-field.rs:45:7
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LL | s.1.1f32;
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| ^^^^^^ invalid suffix `f32`
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error: suffixes on a tuple index are invalid
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--> $DIR/float-field.rs:46:7
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LL | s.1.1e1f32;
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| ^^^^^^^^ invalid suffix `f32`
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error: unexpected token: `1e+f32`
|
||||
--> $DIR/float-field.rs:48:9
|
||||
|
|
||||
LL | { s.1e+f32; }
|
||||
| ^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+f32`
|
||||
--> $DIR/float-field.rs:48:9
|
||||
|
|
||||
LL | { s.1e+f32; }
|
||||
| ^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error: unexpected token: `1e-f32`
|
||||
--> $DIR/float-field.rs:51:9
|
||||
|
|
||||
LL | { s.1e-f32; }
|
||||
| ^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-f32`
|
||||
--> $DIR/float-field.rs:51:9
|
||||
|
|
||||
LL | { s.1e-f32; }
|
||||
| ^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error: unexpected token: `1e+1f32`
|
||||
--> $DIR/float-field.rs:54:9
|
||||
|
|
||||
LL | { s.1e+1f32; }
|
||||
| ^^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e+1f32`
|
||||
--> $DIR/float-field.rs:54:9
|
||||
|
|
||||
LL | { s.1e+1f32; }
|
||||
| ^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error: unexpected token: `1e-1f32`
|
||||
--> $DIR/float-field.rs:56:9
|
||||
|
|
||||
LL | { s.1e-1f32; }
|
||||
| ^^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1e-1f32`
|
||||
--> $DIR/float-field.rs:56:9
|
||||
|
|
||||
LL | { s.1e-1f32; }
|
||||
| ^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error: unexpected token: `1.1e+1f32`
|
||||
--> $DIR/float-field.rs:58:9
|
||||
|
|
||||
LL | { s.1.1e+1f32; }
|
||||
| ^^^^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e+1f32`
|
||||
--> $DIR/float-field.rs:58:9
|
||||
|
|
||||
LL | { s.1.1e+1f32; }
|
||||
| ^^^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error: unexpected token: `1.1e-1f32`
|
||||
--> $DIR/float-field.rs:60:9
|
||||
|
|
||||
LL | { s.1.1e-1f32; }
|
||||
| ^^^^^^^^^
|
||||
|
||||
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `1.1e-1f32`
|
||||
--> $DIR/float-field.rs:60:9
|
||||
|
|
||||
LL | { s.1.1e-1f32; }
|
||||
| ^^^^^^^^^ expected one of `.`, `;`, `?`, `}`, or an operator
|
||||
|
||||
error[E0609]: no field `1e1` on type `S`
|
||||
--> $DIR/float-field.rs:6:7
|
||||
|
|
||||
LL | s.1e1;
|
||||
| ^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `1e1` on type `(u8, u8)`
|
||||
--> $DIR/float-field.rs:9:7
|
||||
|
|
||||
LL | s.1.1e1;
|
||||
| ^^^^^
|
||||
|
||||
error[E0609]: no field `0x1e1` on type `S`
|
||||
--> $DIR/float-field.rs:24:7
|
||||
|
|
||||
LL | s.0x1e1;
|
||||
| ^^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `0x1` on type `S`
|
||||
--> $DIR/float-field.rs:25:7
|
||||
|
|
||||
LL | s.0x1.;
|
||||
| ^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `0x1` on type `S`
|
||||
--> $DIR/float-field.rs:28:7
|
||||
|
|
||||
LL | s.0x1.1;
|
||||
| ^^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `0x1` on type `S`
|
||||
--> $DIR/float-field.rs:30:7
|
||||
|
|
||||
LL | s.0x1.1e1;
|
||||
| ^^^^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `0x1e` on type `S`
|
||||
--> $DIR/float-field.rs:34:7
|
||||
|
|
||||
LL | s.0x1e+1;
|
||||
| ^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `0x1e` on type `S`
|
||||
--> $DIR/float-field.rs:35:7
|
||||
|
|
||||
LL | s.0x1e-1;
|
||||
| ^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `1e1` on type `S`
|
||||
--> $DIR/float-field.rs:42:7
|
||||
|
|
||||
LL | s.1e1f32;
|
||||
| ^^^^^^ unknown field
|
||||
|
|
||||
= note: available fields are: `0`, `1`
|
||||
|
||||
error[E0609]: no field `f32` on type `(u8, u8)`
|
||||
--> $DIR/float-field.rs:44:9
|
||||
|
|
||||
LL | s.1.f32;
|
||||
| ^^^
|
||||
|
||||
error[E0609]: no field `1e1` on type `(u8, u8)`
|
||||
--> $DIR/float-field.rs:46:7
|
||||
|
|
||||
LL | s.1.1e1f32;
|
||||
| ^^^^^^^^
|
||||
|
||||
error: aborting due to 55 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0609`.
|
||||
@ -1,5 +0,0 @@
|
||||
// run-rustfix
|
||||
|
||||
fn main () {
|
||||
((1, (2, 3)).1).1; //~ ERROR unexpected token: `1.1`
|
||||
}
|
||||
@ -1,5 +0,0 @@
|
||||
// run-rustfix
|
||||
|
||||
fn main () {
|
||||
(1, (2, 3)).1.1; //~ ERROR unexpected token: `1.1`
|
||||
}
|
||||
@ -1,11 +0,0 @@
|
||||
error: unexpected token: `1.1`
|
||||
--> $DIR/tuple-float-index.rs:4:17
|
||||
|
|
||||
LL | (1, (2, 3)).1.1;
|
||||
| ------------^^^
|
||||
| | |
|
||||
| | unexpected token
|
||||
| help: try parenthesizing the first index: `((1, (2, 3)).1).1`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user