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improve error reporting for underscore expr

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This commit is contained in:
Folkert 2021-04-12 20:48:58 +02:00
parent 46ab922dd1
commit 2bb1f2cca7
6 changed files with 93 additions and 12 deletions
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8
compiler/problem/src/can.rs
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@ -14,6 +14,12 @@ pub struct CycleEntry {
pub expr_region: Region,
}
#[derive(Clone, Debug, PartialEq)]
pub enum BadPattern {
UnderscoreInDef,
Unsupported(PatternType),
}
/// Problems that can occur in the course of canonicalization.
#[derive(Clone, Debug, PartialEq)]
pub enum Problem {
@ -25,7 +31,7 @@ pub enum Problem {
UnusedArgument(Symbol, Symbol, Region),
PrecedenceProblem(PrecedenceProblem),
// Example: (5 = 1 + 2) is an unsupported pattern in an assignment; Int patterns aren't allowed in assignments!
UnsupportedPattern(PatternType, Region),
UnsupportedPattern(BadPattern, Region),
ShadowingInAnnotation {
original_region: Region,
shadow: Located<Ident>,