report malformed int and float patterns

compiler/can/src/def.rs

@@ -719,6 +719,7 @@ fn pattern_to_vars_by_symbol(
         | FloatLiteral(_)
         | StrLiteral(_)
         | Underscore
+        | MalformedPattern(_, _)
         | UnsupportedPattern(_) => {}
 
         Shadowed(_, _) => {}

compiler/can/src/pattern.rs

@@ -5,7 +5,7 @@ use roc_module::ident::{Ident, Lowercase, TagName};
 use roc_module::symbol::Symbol;
 use roc_parse::ast;
 use roc_parse::pattern::PatternType;
-use roc_problem::can::{Problem, RuntimeError};
+use roc_problem::can::{MalformedPatternProblem, Problem, RuntimeError};
 use roc_region::all::{Located, Region};
 use roc_types::subs::{VarStore, Variable};
 
@@ -35,6 +35,8 @@ pub enum Pattern {
     Shadowed(Region, Located<Ident>),
     // Example: (5 = 1 + 2) is an unsupported pattern in an assignment; Int patterns aren't allowed in assignments!
     UnsupportedPattern(Region),
+    // parse error patterns
+    MalformedPattern(MalformedPatternProblem, Region),
 }
 
 #[derive(Clone, Debug, PartialEq)]
@@ -76,6 +78,7 @@ pub fn symbols_from_pattern_help(pattern: &Pattern, symbols: &mut Vec<Symbol>) {
         | FloatLiteral(_)
         | StrLiteral(_)
         | Underscore
+        | MalformedPattern(_, _)
         | UnsupportedPattern(_) => {}
 
         Shadowed(_, _) => {}
@@ -165,12 +168,13 @@ pub fn canonicalize_pattern<'a>(
         }
 
         FloatLiteral(ref string) => match pattern_type {
-            WhenBranch => {
+            WhenBranch => match finish_parsing_float(string) {
-                let float = finish_parsing_float(string)
+                Err(_error) => {
-                    .unwrap_or_else(|_| panic!("TODO handle malformed float pattern"));
+                    let problem = MalformedPatternProblem::MalformedFloat;
-
+                    malformed_pattern(env, problem, region)
-                Pattern::FloatLiteral(float)
                 }
+                Ok(float) => Pattern::FloatLiteral(float),
+            },
             ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
                 unsupported_pattern(env, ptype, region)
             }
@@ -182,12 +186,13 @@ pub fn canonicalize_pattern<'a>(
         },
 
         NumLiteral(string) => match pattern_type {
-            WhenBranch => {
+            WhenBranch => match finish_parsing_int(string) {
-                let int = finish_parsing_int(string)
+                Err(_error) => {
-                    .unwrap_or_else(|_| panic!("TODO handle malformed int pattern"));
+                    let problem = MalformedPatternProblem::MalformedInt;
-
+                    malformed_pattern(env, problem, region)
-                Pattern::NumLiteral(var_store.fresh(), int)
                 }
+                Ok(int) => Pattern::NumLiteral(var_store.fresh(), int),
+            },
             ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
                 unsupported_pattern(env, ptype, region)
             }
@@ -198,16 +203,19 @@ pub fn canonicalize_pattern<'a>(
             base,
             is_negative,
         } => match pattern_type {
-            WhenBranch => {
+            WhenBranch => match finish_parsing_base(string, *base) {
-                let int = finish_parsing_base(string, *base)
+                Err(_error) => {
-                    .unwrap_or_else(|_| panic!("TODO handle malformed {:?} pattern", base));
+                    let problem = MalformedPatternProblem::MalformedBase(*base);
-
+                    malformed_pattern(env, problem, region)
+                }
+                Ok(int) => {
                     if *is_negative {
                         Pattern::IntLiteral(-int)
                     } else {
                         Pattern::IntLiteral(int)
                     }
                 }
+            },
             ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
                 unsupported_pattern(env, ptype, region)
             }
@@ -215,8 +223,8 @@ pub fn canonicalize_pattern<'a>(
 
         StrLiteral(_string) => match pattern_type {
             WhenBranch => {
-                panic!("TODO check whether string pattern is malformed.");
+                // TODO report whether string was malformed
-                // Pattern::StrLiteral((*string).into())
+                Pattern::StrLiteral((*string).into())
             }
             ptype @ DefExpr | ptype @ TopLevelDef | ptype @ FunctionArg => {
                 unsupported_pattern(env, ptype, region)
@@ -325,6 +333,20 @@ fn unsupported_pattern<'a>(
     Pattern::UnsupportedPattern(region)
 }
 
+/// When we detect a malformed pattern like `3.X` or `0b5`,
+/// report it to Env and return an UnsupportedPattern runtime error pattern.
+fn malformed_pattern<'a>(
+    env: &mut Env<'a>,
+    problem: MalformedPatternProblem,
+    region: Region,
+) -> Pattern {
+    env.problem(Problem::RuntimeError(RuntimeError::MalformedPattern(
+        problem, region,
+    )));
+
+    Pattern::MalformedPattern(problem, region)
+}
+
 pub fn bindings_from_patterns<'a, I>(loc_patterns: I, scope: &Scope) -> Vec<(Symbol, Region)>
 where
     I: Iterator<Item = &'a Located<Pattern>>,
@@ -374,6 +396,7 @@ fn add_bindings_from_patterns(
         | StrLiteral(_)
         | Underscore
         | Shadowed(_, _)
+        | MalformedPattern(_, _)
         | UnsupportedPattern(_) => (),
     }
 }

compiler/constrain/src/pattern.rs

@@ -52,6 +52,7 @@ fn headers_from_annotation_help(
         }
         Underscore
         | Shadowed(_, _)
+        | MalformedPattern(_, _)
         | UnsupportedPattern(_)
         | NumLiteral(_, _)
         | IntLiteral(_)
@@ -117,7 +118,7 @@ pub fn constrain_pattern(
     state: &mut PatternState,
 ) {
     match pattern {
-        Underscore | UnsupportedPattern(_) | Shadowed(_, _) => {
+        Underscore | UnsupportedPattern(_) | MalformedPattern(_, _) | Shadowed(_, _) => {
             // Neither the _ pattern nor erroneous ones add any constraints.
         }
 

compiler/constrain/src/uniq.rs

@@ -342,7 +342,7 @@ fn constrain_pattern(
             state.constraints.push(tag_con);
         }
 
-        Underscore | Shadowed(_, _) | UnsupportedPattern(_) => {
+        Underscore | Shadowed(_, _) | MalformedPattern(_, _) | UnsupportedPattern(_) => {
             // no constraints
         }
     }

compiler/mono/src/expr.rs

@@ -446,6 +446,12 @@ fn pattern_to_when<'a>(
             (env.unique_symbol(), Located::at_zero(RuntimeError(error)))
         }
 
+        MalformedPattern(problem, region) => {
+            // create the runtime error here, instead of delegating to When.
+            let error = roc_problem::can::RuntimeError::MalformedPattern(*problem, *region);
+            (env.unique_symbol(), Located::at_zero(RuntimeError(error)))
+        }
+
         AppliedTag { .. } | RecordDestructure { .. } => {
             let symbol = env.unique_symbol();
 
@@ -1545,7 +1551,10 @@ fn from_can_pattern<'a>(
         StrLiteral(v) => Pattern::StrLiteral(v.clone()),
         Shadowed(region, ident) => Pattern::Shadowed(*region, ident.clone()),
         UnsupportedPattern(region) => Pattern::UnsupportedPattern(*region),
-
+        MalformedPattern(_problem, region) => {
+            // TODO preserve malformed problem information here?
+            Pattern::UnsupportedPattern(*region)
+        }
         NumLiteral(var, num) => match num_argument_to_int_or_float(env.subs, *var) {
             IntOrFloat::IntType => Pattern::IntLiteral(*num),
             IntOrFloat::FloatType => Pattern::FloatLiteral(*num as u64),

compiler/problem/src/can.rs

@@ -3,6 +3,7 @@ use roc_collections::all::MutSet;
 use roc_module::ident::{Ident, Lowercase, TagName};
 use roc_module::operator::BinOp;
 use roc_module::symbol::{ModuleId, Symbol};
+use roc_parse::ast::Base;
 use roc_parse::pattern::PatternType;
 use roc_region::all::{Located, Region};
 
@@ -69,6 +70,8 @@ pub enum RuntimeError {
     },
     // Example: (5 = 1 + 2) is an unsupported pattern in an assignment; Int patterns aren't allowed in assignments!
     UnsupportedPattern(Region),
+    // Example: when 1 is 1.X -> 32
+    MalformedPattern(MalformedPatternProblem, Region),
     UnrecognizedFunctionName(Located<InlinableString>),
     LookupNotInScope(Located<InlinableString>, MutSet<Box<str>>),
     ValueNotExposed {
@@ -95,3 +98,10 @@ pub enum RuntimeError {
     /// When the author specifies a type annotation but no implementation
     NoImplementation,
 }
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum MalformedPatternProblem {
+    MalformedInt,
+    MalformedFloat,
+    MalformedBase(Base),
+}

compiler/reporting/src/error/canonicalize.rs

@@ -338,6 +338,28 @@ fn pretty_runtime_error<'b>(
                 ])
             }
         }
+        RuntimeError::MalformedPattern(problem, region) => {
+            use roc_parse::ast::Base;
+            use roc_problem::can::MalformedPatternProblem::*;
+
+            let name = match problem {
+                MalformedInt => "integer",
+                MalformedFloat => "float",
+                MalformedBase(Base::Hex) => "hex integer",
+                MalformedBase(Base::Binary) => "binary integer",
+                MalformedBase(Base::Octal) => "octal integer",
+            };
+
+            alloc.stack(vec![
+                alloc.concat(vec![
+                    alloc.reflow("This "),
+                    alloc.text(name),
+                    alloc.reflow(" pattern is malformed:"),
+                ]),
+                alloc.region(region),
+            ])
+        }
+
         other => {
             //    // Example: (5 = 1 + 2) is an unsupported pattern in an assignment; Int patterns aren't allowed in assignments!
             //    UnsupportedPattern(Region),

compiler/reporting/tests/test_reporting.rs

@@ -1468,6 +1468,121 @@ mod test_reporting {
         )
     }
 
+    #[test]
+    fn malformed_int_pattern() {
+        report_problem_as(
+            indoc!(
+                r#"
+                when 1 is
+                    100A -> 3
+                    _ -> 4
+                "#
+            ),
+            indoc!(
+                r#"
+                -- SYNTAX PROBLEM --------------------------------------------------------------
+
+                This integer pattern is malformed:
+
+                2 ┆      100A -> 3
+                  ┆      ^^^^
+                "#
+            ),
+        )
+    }
+
+    #[test]
+    fn malformed_float_pattern() {
+        report_problem_as(
+            indoc!(
+                r#"
+                when 1 is
+                    2.X -> 3
+                    _ -> 4
+                "#
+            ),
+            indoc!(
+                r#"
+                -- SYNTAX PROBLEM --------------------------------------------------------------
+
+                This float pattern is malformed:
+
+                2 ┆      2.X -> 3
+                  ┆      ^^^
+                "#
+            ),
+        )
+    }
+
+    #[test]
+    fn malformed_hex_pattern() {
+        report_problem_as(
+            indoc!(
+                r#"
+                when 1 is
+                    0xZ -> 3
+                    _ -> 4
+                "#
+            ),
+            indoc!(
+                r#"
+                -- SYNTAX PROBLEM --------------------------------------------------------------
+
+                This hex integer pattern is malformed:
+
+                2 ┆      0xZ -> 3
+                  ┆      ^^^
+                "#
+            ),
+        )
+    }
+
+    #[test]
+    fn malformed_oct_pattern() {
+        report_problem_as(
+            indoc!(
+                r#"
+                when 1 is
+                    0o9 -> 3
+                    _ -> 4
+                "#
+            ),
+            indoc!(
+                r#"
+                -- SYNTAX PROBLEM --------------------------------------------------------------
+
+                This octal integer pattern is malformed:
+
+                2 ┆      0o9 -> 3
+                  ┆      ^^^
+                "#
+            ),
+        )
+    }
+
+    #[test]
+    fn malformed_bin_pattern() {
+        report_problem_as(
+            indoc!(
+                r#"
+                when 1 is
+                    0b4 -> 3
+                    _ -> 4
+                "#
+            ),
+            indoc!(
+                r#"
+                -- SYNTAX PROBLEM --------------------------------------------------------------
+
+                This binary integer pattern is malformed:
+
+                2 ┆      0b4 -> 3
+                  ┆      ^^^
+                "#
+            ),
+        )
+    }
+
     #[test]
     fn missing_fields() {
         report_problem_as(